Rock-drilling-machine chuck.



L. 0. BAYLES. ROCK DRILLING MACHINE GHUGK. APPLICATION FILED JULY 9,I907.

Patented Nov. 17', 190.8.

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NORRIS PErERs co w L. (LBAYLES. ROCK DRILLING MACHINE GHUGK. APPLICATIONFILED JULY 9, 1907.

Patented N0v.'17, 1908.

4 SHEETS-SHEET 2.

L. o. BAYLES. I ROCK DRILLING MACHINE GHUGK. APPLICATION FILED JULY 9,1907.

Patented Nov. 17, 1908.

4 SHEETS-SHEET 8.

r": NORRIS PETERS co, WASHINCTON, n. c

L. 0'. BAYLES. ROCK DRILLING MACHINE CHUCK. APPLICATION FILED JULY 9,1907.

903,948.' Patented Nov. 17,1908.

4 SHEETS-SHEET 4.

qa l I I 55 Q? KI 3 v H y 2% A 'g-:,:

UNITED STATES PATENT OFFICE.

LEWIS OONDICT BAYLES, OF JOHANNESBURG, TRANSVAAL.

ROCK-DRILLIN G-MACHIN E CHUCK.

To all whom it may concern:

Be it known that I, LEWIS OONDICT BAYLES, a citizen of the UnitedStates, and resident of Johannesburg, Transvaal, have invented certainnew and useful Improvements in Rock-Drilling-Uachine Chucks, of whichthe following is a specification.

This invention relates to the chucks of rock-drilling machines, and inparticular to that type in which the drill steel or bit is secured inthe head by means of a wedge and gripping pad in conjunction with a Ubolt. With this type of chuck as at present con structed difiiculty isfrequently experienced in inserting the shank end of the steel inrenewing the bits, owing to the gripping pad and wedge falling into thebore of the chuck when the bit is removed, consequently necessitatingthe partial rotation of the chuck to allow the pad to fall sufficientlyout of the bore to permit of the insertion of the steel.

One object of my invention is to obviate this defect. The gripping padand wedge have heretofore had a tendency to disengage the U bolt andfall out of position and another object of my invention is to preventsuch disengagement.

A further object is to insure the maintenance of the wedge parallel withthe bore of the chuck or axis of the piston rod.

Another defect of the type of chuck referred to has been that thedriving forward of the wedge to secure the bit has forced the forwardend of the gripping pad against the front end of the pad slot in thechuck. As the chuck head is necessarily made of comparatively soft metalthe result has been a distortion of the front head or the gradualhammering outward of the metal of the head at the front end of the slot.

My invention also relates to the construction and arrangement of a halfbushing for the chuck. Heretofore the head of the chuck has beenconstructed with one or more holes or recesses in the bottom to beengaged by a projection or projections formed on the outside of the halfbushing. Now this construction has weakened the head and increased thetendency for it to spread or burst when the wedge draws up the U bolt inthe operation of securing the bit.

To the attainment of these several objects my invention consists,firstly, in flaring or making bell mouthed the longitudinal groove orrecess in the gripping pad which bears Specification of Letters Patent.

Application filed. July 9, 1907.

Patented Nov. 17, 1908.

Serial No. 382,962.

on the bit shank, (I prefer to make it flaring at both ends to permit ofthe reversal of the gripping'pad) and to the provision of longitudinalribs or projections on the gripping pad which are adapted to engage thetop of the head and so prevent the pad falling beyond a certain distanceinto the bore of the chuck when the drill is removed. Secondly, to theprovision on the top of the gripping pad of a rib or projection and acorrespondingly shaped longitudinal. recess or groove in the contiguousface of the wedge (or vice versa). Thirdly, to the provision of recessesin the longitudinal ribs or projections on the gripping pad to engagethe inside of the U bolt to prevent longitudinal movement of the pad.Fourthly, to the provision of two parallel grooves or recesses formedlongitudinally of and in the bore of the head and in providing on thehalf bushing two corresponding parallel ribs or projections engagingsaid groove (or vice versa), and fifthly, to the provision in the sidesof the half bushing of recesses or grooves which are engaged by the Ubolt 'and operate to prevent longitudinal displacement of the halfbushing.

By the present improvements it is not possible to remove any part of thechuck or for any part to get out of alinement or position except bothnuts of the U bolt be first removed and the U bolt withdrawn.

To facilitate the detailed description of the several improvements Iappend four sheets of illustrative drawings numbered to correspond withthe following description thereof.

Figure 1 is an end elevation of the chuck. Fig. 2 is a longitudinalsection of the head showing the gripping pad and wedge in elevation.Fig. 3 is a front elevation of the gripping pad detached. Fig. 4 is aside elevation of Fig. 3. Fig. 5 is a plan of Fig. 4. Fig. 6 is a sideelevation of the wedge. Fig. 7 is a plan of Fig. 6. Fig. 8 is a sectionof Fig. 7 on line mzv. Fig. 9 is an end elevation of the half bushing,and Fig. 10 is a plan of Fig. 9. Fig. 11 is a side elevation of Fig. 10.Fig. 12 is an nd elevation of a chuck illustrating certainmodifications. Fig. 13 is a longitudinal section, with the pad and wedgein elevation, of the chuck shown in Fig. 12. Fig. 14 is an end elevationof the gripping pad detached. Fig.

15 is a side elevation of Fig. 14. Fig.

16 is a plan of Fig. 15. Fig. 17 is a side elevation of the wedge. Fig.18 is a plan of Fig. 17. Fig. 19 is a section of Fig. 17 on line y-y.Fig. 20 is an end elevation of the half bushing. Fig. 21 is a plan ofFig. 20, and Fig. 22 is a side elevation of Fig. 21.

Referring to the arrangement illustrated in Figs. 1 to 11, illustrativeof certain features of the invention, 1 is the head or body of the chuckfixed to or formed integral with the piston rod 2.

3 is the bore of the chuck in which is secured the shank of the bit ordrill steel 4. The drill steel is shown of the ordinary octagonalsection but it will be obvious that by suitably shaping the half bushingand gripping pad internally it may be made of any other desired section.The shape shown may in some cases be preferred as it obviates thenecessity for shanking or rounding the end of the drill steel 4.

5 is the U bolt, which, as usual, passes through holes 6 formed throughthe head 1 and has screwed 011 its extremities the retaining nuts 7.

8 is a longitudinal slot formed through the head 1 communicating withthe bore 3, and 9 is the gripping pad positioned therein. The grippingpad 9 as shown, is formed on the inside with an angular recess or groove10 to receive a portion of the drill steel 4. The ends of this groove orrecess 10 are made with a flaring mouth or made bell shaped as seen at11 in Figs. 2, 3.and 4. This configuration of the ends of the grippingpad 9 facilitates the insertion of the drill steel 4 by increasing thesize of the opening between the end of the pad and the bushing. In thedrawing I show both ends of the pad 9 shaped as described inorder topermit of the pad being reversed if desired. The pad 9 is also fashionedwith two parallel longitudinal ribs or projections 12 at the outside,which engage the top of the head 1 along the top edges of thelongitudinal slot 8 and so operate to prevent the gripping pad 9 fallinginto the bore of the chuck beyond a certain point. If desired, theseribs or projections 12 on the gripping pad 9 may be dispensed with andthe gripping pad be allowed to fall sufiiciently far into the bore 3 ofthe chuck for the lower edges 13 to engage the upper edges 14 of thehalf bushing 15. In the ribs or projections 12 are formed curvedrecesses 12 which are engaged by the inside of the U bolt 5 and soprevent longitudinal movement of the pad 9 in the slot 8, which obviatesthe front end of the pad striking the front end of the slot when thewedge is driven forward.

17 is the wedge, the plain face of which, when the wed 'e is in positionhas contact with the top of the pad 9, so that the wedge and padslidingly engage each other. The upper or inclined tapered face 19 ofthe wedge is rounded transverselysee Figs. 1

and 8-to correspond to the curvature of the U bolt 5 which it slidinglyengages. This construction operates to retain and guide the wedge whenit is driven in either direction and insures it being maintainedparallel to the bore 3 of the chuck or longitudinal axis of the drillsteel 4.

20 are lugs or projections on the ends of the Wedge 17 to assist inpreventing it disengaging the U bolt 5 and for receiving the impact-s ofa hammer for driving the wedge in either direction.

The half bushing 15 is constructed along each edge on the outside withprojections 21 and in the bore of the chuck are formed correspondinglyshaped grooves or recesses 22 engaged thereby. This secures the halfbushing 15 against rotary movement in the bore 3 of the chuck. The halfbushing 15 is shown recessed longitudinally at 23 to receive a portionof the drill steel 4. The bolt holes 6 intersect the longitudinalgrooves or recesses 22 in the bore of the chuck and in the sides orupper edges 14 of the half bushing 15 are formed recesses 24 which areengaged by the bolt 5 and serve to prevent longitudinal displacement ofthe half bushing 15.

The construction described in connection with Figs. 1 to 11 is thatpreferred for new chucks.

Referring now to the construction illus trate in Figs. 12 to 22, Iillustrate the application of certain features of the invention to astandard type of rock-drill chuck. The same numerals of referenceindicate the same or corresponding parts in these figures of thedrawings. In this construction, on the top of the gripping pad 9 andlongitudinally thereof is provided a rib or projection 16. The wedge 17on its inner parallel edge is constructed with a longitudinal groove orrecess 18 in which the projection 16 on the pad 9 fits, so that thewedge and pad slidingly engage each other. This construction serves as aretaining and guiding means for the wedge 17 and insures it beingmaintained parallel to the longitudinal axis of the bore 3 of the chuckor drill steel 4. The upper inclined or tapered edge 19 of the wedge 17slidingly engages the inside of the U bolt 5.

It will be apparent that instead of forming the projection 16 011 thepad 9 and the recess 18 on the wedge 17, the recess may be formed in thepad and the projection on the wedge.

The recesses 24 in the half bushing 15, with which the U bolt 5 engages,are made sufficiently long to provide for the reversal of said bushing,as the U bolt is not in this case positioned at the center of thelongitudinal ribs or projections 21 as in the previously describedconstruction. l/Vhen in position the U bolt 5 engages the same end ofeach of the recesses 24 and when the half bushing is reversed it engagesthe opposite end of each of the recesses 24:.

Vhat I claim as my invention and desire to protect by Letter Patentis 1. In a rock-drilling machine chuck the combination of the head and Ubolt with a half bushing positioned in the bore of the head andnon-rotatably retained therein by longitudinal projections engagingcorresponding longitudinal grooves, as set forth.

2. In a rock-drilling machine chuck the combination of the head, U bolt,and gripping pad, with a half bushing positioned in the bore oppositethe pad and non-rotatably retained therein by providing the head withlongitudinal grooves and the half bushing with longitudinal projectionsengaging said grooves, as and for the purpose set forth.

3. In a rock-drilling machine chuck, the combination of the head, Ubolt, and gripping pad, with a half bushing arranged in the boreopposite the pad the half bushing being formed with externallongitudinal projections engaging corresponding longitudinal recesses inthe bore, and means for locking the half bushing in the bore by the Ubolt as set forth.

l. In a rock-drilling machine chuck, the combination of the head, U boltand a gripping pad locked in position by the U bolt, with a half bushingarranged in the bore opposite the pad, the half bushing being formedwith external longitudinal projections engagin correspondinglongitudinal recesses in theImre, said external projections havingrecesses registering with the bolt holes in the head so that the halfbushing is engaged by the U bolt and thereby secured againstlongitudinal displacement, as set forth.

5. In a rock-drilling machine chuck, in combination, a head constructedwith an axial bore, a longitudinal slot in communication with the bore,a transverse bolt hole at each side of the bore, and oppositely disposedlongitudinal recesses in the bore intersecting the bolt holes, a U boltlocated in the bolt holes, a pad in the slot, said pad being constructedalong its longitudinal edges with outwardly extending projections,overlapping the longitudinal edges of the slot, each of said projectionshaving a recess engaged by the U bolt, a wedge arranged between the Ubolt and pad, a half bushing constructed along its two longitudinaledges with external projections engaging the oppositely disposedlongitudinal recesses in the bore,

said external projections having recesses coinciding with the bolt holesand through which latter recesses the U bolt passes, as set forth.

6. In a rock-drilling machine chuck, the combination of a head, having aslot communicating with the bore thereof, a gripping pad located in saidslot, and a wedge positioned next the pad, the pad and wedge beingformed, the one with a projection and the other with a groove in whichsaid projection engages, as and for the purpose set forth.

7. In a rock-drilling machine chuck, in combination, a head constructedwith an axial bore, a longitudinal slot in communication with the bore,and a transverse bolt hole at each side of the bore, a U bolt in thebolt holes, a pad in the slot, said pad being constructed along twoedges with outwardly extending projections overlapping the longitudinaledges of the slot, each of said projec tions having a recess engaged bythe U bolt and a wedge positioned between the U bolt and pad, the padand wedge being formed, the one with a projection and the other with agroove in which said projection engages, as and for the purpose setforth.

8. In a rock-drilling machine chuck, in combination, a head constructedwith an axial bore, a longitudinal slot in communication with the bore,a transverse bolt hole at each side of the bore, and oppositely disposedlongitudinal recesses in the bore intersecting the bolt holes, a U boltlocated in the bolt holes, a pad in the slot, said pad being constructedalong its longitudinal edges with outwardly extending projections,overlapping the longitudinal edges of the slot, each of said projectionshaving a recess engaged by the U bolt, a wedge arranged between the Ubolt and pad, the pad and wedge being formed, the one with a projectionand the other with a groove engaged thereby, a half bushing constructedalong its two longitudinal edges with external projections engaging theoppositely disposed longitudinal recesses in the bore, said externalprojections having recesses coinciding with the bolt holes and throughwhich latter recesses the U bolt passes, as set forth.

In witness whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

LEWIS CONDIGT BAYLES.

Witnesses CHAS. OVENDALE, FRED OVENDALE.

